docs: remove Docker design doc
docs: remove Docker design doc

This design was never implemented and has been superceded by the `ng deploy` design.

catull/angular-cli,angular/angular-cli,geofffilippi/angular-cli,clydin/angular-cli,catull/angular-cli,clydin/angular-cli,geofffilippi/angular-cli,geofffilippi/angular-cli,ocombe/angular-cli,Brocco/angular-cli,ocombe/angular-cli,catull/angular-cli,angular/angular-cli,angular/angular-cli,ocombe/angular-cli,Brocco/angular-cli,Brocco/angular-cli,Brocco/angular-cli,geofffilippi/angular-cli,clydin/angular-cli,ocombe/angular-cli,Brocco/angular-cli,ocombe/angular-cli,catull/angular-cli,angular/angular-cli,clydin/angular-cli